Variations in hydrography, nutrients and chlorophyll a in the marginal ice-zone and the central Barents Sea

Reigstad, Marit; Wassmann, Paul; Riser, Christian Wexels; Øygarden, Sigrid; Rey, Francisco

doi:10.1016/s0924-7963(02)00167-7

Cited by 164 publications

(122 citation statements)

References 36 publications

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“…Integrated chlorophyll a in the water column was typically 100-300 mg m −2 in bloom situations with a maximum of about 450 mg m −2 . Similar chlorophyll a concentrations have been found also in other studies in the central Barents Sea (Kristiansen et al, 1994;Reigstad et al, 2002;Wassmann et al, 1999Wassmann et al, , 2006b.…”

Section: Chlorophyllsupporting

confidence: 90%

“…In the Barents Sea, the Atlantic Water has a winter content of 10-13 μg l −1 NO 3 − (Kristiansen et al, 1994;Reigstad et al, 2002). sector.…”

Section: Nutrientsmentioning

confidence: 99%

“…Rey et al (1987) used a N/Chl a ratio of 1.2 (based on empirical data on phytoplankton C and chlorophyll a in bloom situations in the Barents Sea), which would give a maximum of about 9 μg chlorophyll a l −1 for a consumption of 11 μg-at N l −1 . However, there are a few cases where values in the range of 10-15 μg chlorophyll a l −1 have been observed in the deeper layer of developing blooms (where shade adaptation and sinking may contribute to higher levels; Reigstad et al, 2002;Skjoldal et al, 1987;Wassmann et al, 1999).…”

Section: Chlorophyllmentioning

confidence: 99%

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The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems

Hunt

Blanchard

Boveng

et al. 2013

Journal of Marine Systems

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139

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Section: Chlorophyllsupporting

confidence: 90%

“…In the Barents Sea, the Atlantic Water has a winter content of 10-13 μg l −1 NO 3 − (Kristiansen et al, 1994;Reigstad et al, 2002). sector.…”

Section: Nutrientsmentioning

confidence: 99%

Section: Chlorophyllmentioning

confidence: 99%

See 1 more Smart Citation

The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems

Hunt

Blanchard

Boveng

et al. 2013

Journal of Marine Systems

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139

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“…The ecosystem model includes nutrients (NO 3 , NH 4 , and SiO 4 ), phytoplankton (diatoms and flagellates), bacteria, heterotrophic nanoflagellates, microzooplankton, and two mesozooplankters: the Atlantic Calanus finmarchicus and the arctic C. glacialis, two compartments for fast and slow sinking detritus, DOC, and sediments. The model uses constant stoichiometry with a C:N ratio equal 7.6, based upon average data from the Barents Sea [Reigstad et al, 2002]. In the present study, SINMOD data are from a pan-Arctic configuration with 20 km horizontal grid resolution and with 25 vertical layers.…”

Section: A7 Modelmentioning

confidence: 99%

Net primary productivity estimates and environmental variables in the Arctic Ocean: An assessment of coupled physical-biogeochemical models

Lee

Matrai

Friedrichs

et al. 2016

J. Geophys. Res. Oceans

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The relative skill of 21 regional and global biogeochemical models was assessed in terms of how well the models reproduced observed net primary productivity (NPP) and environmental variables such as nitrate concentration (NO3), mixed layer depth (MLD), euphotic layer depth (Zeu), and sea ice concentration, by comparing results against a newly updated, quality‐controlled in situ NPP database for the Arctic Ocean (1959–2011). The models broadly captured the spatial features of integrated NPP (iNPP) on a pan‐Arctic scale. Most models underestimated iNPP by varying degrees in spite of overestimating surface NO3, MLD, and Zeu throughout the regions. Among the models, iNPP exhibited little difference over sea ice condition (ice‐free versus ice‐influenced) and bottom depth (shelf versus deep ocean). The models performed relatively well for the most recent decade and toward the end of Arctic summer. In the Barents and Greenland Seas, regional model skill of surface NO3 was best associated with how well MLD was reproduced. Regionally, iNPP was relatively well simulated in the Beaufort Sea and the central Arctic Basin, where in situ NPP is low and nutrients are mostly depleted. Models performed less well at simulating iNPP in the Greenland and Chukchi Seas, despite the higher model skill in MLD and sea ice concentration, respectively. iNPP model skill was constrained by different factors in different Arctic Ocean regions. Our study suggests that better parameterization of biological and ecological microbial rates (phytoplankton growth and zooplankton grazing) are needed for improved Arctic Ocean biogeochemical modeling.

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“…Although consistent with the dominance of diatoms at the SCM, the Si:NO 3 À drawdown ratio for Franklin Bay (1.86; Figure 9a) and the southeast Beaufort Sea in general (1.75; Simpson et al [2008]) was much higher than in the North Water (1.0 [Tremblay et al, 2002a]) and in the Barents Sea (ca. 0.5 when diatoms dominate [Reigstad et al, 2002]). …”

Section: Elemental Stoichiometrymentioning

confidence: 99%

Vertical stability and the annual dynamics of nutrients and chlorophyll fluorescence in the coastal, southeast Beaufort Sea

et al. 2008

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[1] The first quasi-annual time series of nutrients and chlorophyll fluorescence in the southeast Beaufort Sea showed that mixing, whether driven by wind, local convection, or brine rejection, and the ensuing replenishment of nutrients at the surface were minimal during autumn and winter. Anomalously high inventories of nutrients were observed briefly in late December, coinciding with the passage of an eddy generated offshore. The concentrations of NO 3 À in the upper mixed layer were otherwise low and increased slowly from January to April. The coincident decline of NO 2 À suggested nitrification near the surface. The vernal drawdown of NO 3 À in 2004 began at the ice-water interface during May, leaving as little as 0.9 mM of NO 3 À when the ice broke up. A subsurface chlorophyll maximum (SCM) developed promptly and deepened with the nitracline until early August. The diatom-dominated SCM possibly mediated half of the seasonal NO 3 À consumption while generating the primary NO 2 À maximum. Dissolved inorganic carbon and soluble reactive phosphorus above the SCM continued to decline after NO 3 À was depleted, indicating that net community production (NCP) exceeded NO 3 À -based new production. These dynamics contrast with those of productive Arctic waters where nutrient replenishment in the upper euphotic zone is extensive and NCP is fueled primarily by allochthonous NO 3 À . The projected increase in the supply of heat and freshwater to the Arctic should bolster vertical stability, further reduce NO 3 À -based new production, and increase the relative contribution of the SCM. This trend might be reversed locally or regionally by the physical forcing events that episodically deliver nutrients to the upper euphotic zone.

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Variations in hydrography, nutrients and chlorophyll a in the marginal ice-zone and the central Barents Sea

Cited by 164 publications

References 36 publications

The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems

The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems

Net primary productivity estimates and environmental variables in the Arctic Ocean: An assessment of coupled physical-biogeochemical models

Vertical stability and the annual dynamics of nutrients and chlorophyll fluorescence in the coastal, southeast Beaufort Sea

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